[Night Light] CL4: Automatic schedule backend.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 6518bfffdb464f8268fd4676eb22752de4fea461..1fbd81f9822196da41a7be50782065641e01bf19 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -421,6 +421,8 @@ component("ash") {
     "system/networking_config_delegate.h",
     "system/night_light/night_light_controller.cc",
     "system/night_light/night_light_controller.h",
+    "system/night_light/time_of_day.cc",
+    "system/night_light/time_of_day.h",
     "system/night_light/tray_night_light.cc",
     "system/night_light/tray_night_light.h",
     "system/overview/overview_button_tray.cc",
@@ -860,6 +862,7 @@ component("ash") {
     "//components/vector_icons",
     "//components/wallpaper",
     "//device/bluetooth",
+    "//device/geolocation",
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/client:gles2_interface",
     "//media",
@@ -1217,6 +1220,7 @@ source_set("common_unittests") {
     "system/network/tray_network_unittest.cc",
     "system/network/vpn_list_unittest.cc",
     "system/night_light/night_light_controller_unittest.cc",
+    "system/night_light/time_of_day_unittest.cc",
     "system/night_light/tray_night_light_unittest.cc",
     "system/overview/overview_button_tray_unittest.cc",
     "system/palette/mock_palette_tool_delegate.cc",